56 lines
1.4 KiB
Go
56 lines
1.4 KiB
Go
|
package cty
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
)
|
||
|
|
|
||
|
|
// PathError is a specialization of error that represents where in a
|
||
|
|
// potentially-deep data structure an error occured, using a Path.
|
||
|
|
type PathError struct {
|
||
|
|
error
|
||
|
|
Path Path
|
||
|
|
}
|
||
|
|
|
||
|
|
func errorf(path Path, f string, args ...interface{}) error {
|
||
|
|
// We need to copy the Path because often our caller builds it by
|
||
|
|
// continually mutating the same underlying buffer.
|
||
|
|
sPath := make(Path, len(path))
|
||
|
|
copy(sPath, path)
|
||
|
|
return PathError{
|
||
|
|
error: fmt.Errorf(f, args...),
|
||
|
|
Path: sPath,
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewErrorf creates a new PathError for the current path by passing the
|
||
|
|
// given format and arguments to fmt.Errorf and then wrapping the result
|
||
|
|
// similarly to NewError.
|
||
|
|
func (p Path) NewErrorf(f string, args ...interface{}) error {
|
||
|
|
return errorf(p, f, args...)
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewError creates a new PathError for the current path, wrapping the given
|
||
|
|
// error.
|
||
|
|
func (p Path) NewError(err error) error {
|
||
|
|
// if we're being asked to wrap an existing PathError then our new
|
||
|
|
// PathError will be the concatenation of the two paths, ensuring
|
||
|
|
// that we still get a single flat PathError that's thus easier for
|
||
|
|
// callers to deal with.
|
||
|
|
perr, wrappingPath := err.(PathError)
|
||
|
|
pathLen := len(p)
|
||
|
|
if wrappingPath {
|
||
|
|
pathLen = pathLen + len(perr.Path)
|
||
|
|
}
|
||
|
|
|
||
|
|
sPath := make(Path, pathLen)
|
||
|
|
copy(sPath, p)
|
||
|
|
if wrappingPath {
|
||
|
|
copy(sPath[len(p):], perr.Path)
|
||
|
|
}
|
||
|
|
|
||
|
|
return PathError{
|
||
|
|
error: err,
|
||
|
|
Path: sPath,
|
||
|
|
}
|
||
|
|
}
|